18

我创建了一个 DialogUtil，它显示了不同情况下 JOptionPan 的数量。有时在我的动作类中使用如下的空参数调用此方法。

DialogUtil.showNotExist(null,xml.getName().concat(" is null or"));

在这种情况下，JOptionPane 不会出现在窗口顶部。

如何向 JOptionPane 添加一些内容以始终显示在顶部？

public static void showNotExist(JPanel panel, String action) {
    JOptionPane.showMessageDialog(panel, new JLabel(action.concat(" doesn't exist."), 2));
}
4

6 回答 6

18

您可以使用以下代码将 JOptionPane 始终设置在最前面：-

JFrame jf=new JFrame();
jf.setAlwaysOnTop(true);
int response = JOptionPane.showConfirmDialog(jf,"Message", "Title", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
于 2017-11-23T07:23:49.590 回答
17

你有没有尝试过这样的事情？

JOptionPane optionPane = new JOptionPane();
JDialog dialog = optionPane.createDialog("Title");
dialog.setAlwaysOnTop(alwaysOnTop);
dialog.setVisible(true);

无法保证操作系统会允许您的对话框始终位于顶部，但它通常会起作用。

如果您有一个现有的窗口或对话框，并且希望将其置于顶部，但又不想永久设置 alwaysOnTop，则应该在保留 alwaysOnTop 的旧值的情况下这样做：

boolean supported = window.isAlwaysOnTopSupported();
boolean old_alwaysOnTop = window.isAlwaysOnTop();
if (supported) {
  window.setAlwaysOnTop(true);
}
window.toFront();
window.requestFocus();
if (supported) {
  window.setAlwaysOnTop(old_alwaysOnTop);
}

仅在 SwingThread 上运行该代码。

于 2012-06-08T23:10:40.923 回答
5

有两个可能的问题

  • JOptionPane 从 EDT 中调用，然后只有工具栏（来自 Native OS 的标题在屏幕上可见，RootPane 不可见）在屏幕上可见

  • 在那里你可以测试 JOptionPanes 功能，其中 JOptionPane.showInternalMessageDialog() 在所有情况下都会造成麻烦，即有另一个带有 setModal(true) 的 JDialog，我不知道的真正原因，同样应该是 ModalityTypes

  • 无法同时在屏幕上显示两个 JOptionPanes

代码

import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;
import javax.swing.Timer;
//http://stackoverflow.com/questions/8670297/make-java-swing-modal-dialog-behave-like-mac-osx-dialogs
public class ModalDialogDemoFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private ModalDialogDemoFrame modalDialogDemo;

    public ModalDialogDemoFrame() {
        modalDialogDemo = this;
        setBounds(100, 100, 400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton buttonDialog = new JButton("Open Dialog");
        buttonDialog.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                // Create a Modal Dialog with this Frame as Parent.
                ModalDialog modalDialog = new ModalDialog(modalDialogDemo, true);
                modalDialog.setVisible(true);
            }
        });
        getContentPane().add(buttonDialog, BorderLayout.CENTER);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                try {
                    ModalDialogDemoFrame window = new ModalDialogDemoFrame();
                    window.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}
//http://stackoverflow.com/questions/4577424/distinguish-between-a-single-click-and-a-double-click-in-java/4577475#4577475
class ClickListener extends MouseAdapter implements ActionListener {

    private final static int clickInterval = (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval");
    private MouseEvent lastEvent;
    private Timer timer;

    public ClickListener() {
        this(clickInterval);
    }

    public ClickListener(int delay) {
        timer = new Timer(delay, this);
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() > 2) {
            return;
        }
        lastEvent = e;
        if (timer.isRunning()) {
            timer.stop();
            doubleClick(lastEvent);
        } else {
            timer.restart();
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        timer.stop();
        singleClick(lastEvent);
    }

    public void singleClick(MouseEvent e) {
    }

    public void doubleClick(MouseEvent e) {
    }
}

class ModalDialog extends JDialog {

    private static final long serialVersionUID = 1L;

    public ModalDialog(JFrame parent, boolean modal) {
        Dimension dimensionParentFrame = parent.getSize();
        setSize(new Dimension((parent == null) ? 300 : dimensionParentFrame.width / 2, 75));
        Dimension dimensionDialog = getSize();
        int x = parent.getX() + ((dimensionParentFrame.width - dimensionDialog.width) / 2);
        setLocation(x, parent.getY() + parent.getInsets().top);
        //setUndecorated(true);
        setModal(modal);
        //setUndecorated(true);
        //getRootPane().setWindowDecorationStyle(JRootPane.ERROR_DIALOG);
        setModalityType(ModalityType.APPLICATION_MODAL);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        final JButton buttonClose = new JButton("Close");
        buttonClose.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
//ok
                /*JOptionPane.showMessageDialog(buttonClose,
                "Eggs are not supposed to be green.",
                "Inane warning",
                JOptionPane.WARNING_MESSAGE);*/
//uncomment for un_handled GUI, JOptionPane is behing JFrame I think....
                /*JOptionPane.showInternalMessageDialog(buttonClose,
                "Eggs are not supposed to be green.",
                "Inane warning",
                JOptionPane.WARNING_MESSAGE);*/
//ok
                /*JOptionPane.showConfirmDialog(buttonClose,
                "Eggs are not supposed to be green.",
                "Inane warning",
                JOptionPane.WARNING_MESSAGE);*/
//ok                
                /*JOptionPane.showMessageDialog(null,
                "Eggs are not supposed to be green.",
                "Inane warning",
                JOptionPane.WARNING_MESSAGE);*/
//uncomment for un_handled GUI
//Exception occurred during event dispatching:
//java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent                
                /*JOptionPane.showInternalMessageDialog(null,
                "Eggs are not supposed to be green.",
                "Inane warning",
                JOptionPane.WARNING_MESSAGE);*/
//ok                
                JOptionPane.showConfirmDialog(null,
                        "Eggs are not supposed to be green.",
                        "Inane warning",
                        JOptionPane.WARNING_MESSAGE);
                dispose();
            }
        });
        add(buttonClose, BorderLayout.CENTER); // comment for listening
        addMouseListener(new ClickListener() {

            @Override
            public void singleClick(MouseEvent e) {
                System.out.println("single");
            }

            @Override
            public void doubleClick(MouseEvent e) {
                System.out.println("double");
            }
        });
    }
}
于 2012-06-04T12:22:24.677 回答
4

我不知道是什么WebOptionPane，WebPanel但如果它们基于JOptionPane，那么问题是您将null第一个参数传递给该showXXX()方法。如果你希望它JOptionPane是模态的——这迫使它位于指定窗口的前面——那么你需要为第一个参数指定一个窗口（即，JFramea——。

于 2012-06-04T12:11:39.753 回答
1 
public static void showNotExist(JPanel panel, String action) {
    JOptionPane.showMessageDialog(rootPane, new JLabel(action.concat(" doesn't exist."), 2));
}

尝试将根窗格作为 showMessageDialog 部分中的第一个值

于 2015-07-13T17:35:25.463 回答
1

如果您的类扩展了 JFrame，那么只需设置类属性 setAlwaysOnTop(true); 在 JOptionPane.showMessageDialog(null,"OKay"); 之前的构造函数中的任何位置；

我用它来复制文件并检查，甚至不需要 JFrame 而需要 JOptionPane。

PS 如果您不希望主 JFrame 始终显示在顶部，则需要创建虚拟 JFrame 或重置属性 setAlwaysOnTop(false); 在 JOptionPane 之后。

于 2016-09-08T00:20:47.283 回答